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diff --git a/src/io_thread.hpp b/src/io_thread.hpp
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+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZS_IO_THREAD_HPP_INCLUDED__
+#define __ZS_IO_THREAD_HPP_INCLUDED__
+
+#include <vector>
+
+#include "object.hpp"
+#include "i_thread.hpp"
+#include "i_poller.hpp"
+#include "i_poll_events.hpp"
+#include "fd_signaler.hpp"
+
+namespace zs
+{
+
+    //  Generic part of the I/O thread. Polling-mechanism-specific features
+    //  are implemented in separate "polling objects".
+
+    class io_thread_t : public object_t, public i_poll_events, public i_thread
+    {
+    public:
+
+        io_thread_t (class dispatcher_t *dispatcher_, int thread_slot_);
+
+        //  Launch the physical thread.
+        void start ();
+
+        //  Ask underlying thread to stop.
+        void stop ();
+
+        //  Wait till undelying thread terminates.
+        void join ();
+
+        //  To be called when the whole infrastrucure is being closed (zs_term).
+        //  It's vital to call the individual commands in this sequence:
+        //  stop, join, shutdown.
+        void shutdown ();
+
+        //  Returns signaler associated with this I/O thread.
+        i_signaler *get_signaler ();
+
+        //  i_poll_events implementation.
+        void in_event ();
+        void out_event ();
+        void timer_event ();
+
+        //  i_thread implementation.
+        void attach_session (class session_t *session_);
+        void detach_session (class session_t *session_);
+        struct i_poller *get_poller ();
+
+        //  Command handlers.
+        void process_stop ();
+
+        //  Returns load experienced by the I/O thread.
+        int get_load ();
+
+    private:
+
+        //  Clean-up.
+        ~io_thread_t ();
+
+        //  Poll thread gets notifications about incoming commands using
+        //  this signaler.
+        fd_signaler_t signaler;
+
+        //  Handle associated with signaler's file descriptor.
+        handle_t signaler_handle;
+
+        //  I/O multiplexing is performed using a poller object.
+        i_poller *poller;
+
+        //  Vector of all sessions associated with this app thread.
+        typedef std::vector <class session_t*> sessions_t;
+        sessions_t sessions;
+
+    };
+
+}
+
+#endif